Hi @reuvygroovy ,
Based on my research, embedding and directly playing videos in a mail message isn't supported in Outlook client for various reasons (mainly security related). Here are some relevant thread and article:
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
So, there may be no option that could meet your need in Outlook, if you still need this fuction and would like to submit some suggestions about it, it's recommended to submit a feedback in Outlook like below(Help>Suggest a feature), your time and effort would be highly appreciated and benefit Microsoft improve the product in the feature.
Hope that would be helpful to you.
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